Overview
The Siemens B250 is a 50 A, 120/240 V AC, two-pole Type BL bolt-on circuit breaker in the Siemens BL 125 A frame family. It provides thermal-magnetic overload and short-circuit protection with a 10 kA interrupting rating for compatible Siemens panelboards.
Key Features
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Thermal-magnetic common trip: Both poles open together during an overload or short-circuit trip.
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Bolt-on mounting: Secures to compatible Siemens panelboard bus equipment for a fixed connection.
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BL 125 A frame: The exact B250 is a standard 10 kA Type BL breaker; the 125 A designation is the frame rating, not a 125H interrupt class.
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Cu/Al load connection: Load lugs accept the manufacturer-specified copper and aluminum conductor ranges.
Specifications
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Manufacturer / model: Siemens B250
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Series / frame: BL / BL 125 A frame
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Current / voltage: 50 A / 120/240 V AC
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Poles / phase: 2 poles / single phase
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Protection: Thermal magnetic; common trip
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Interrupting rating: 10 kA
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Mounting / terminal: Bolt-on; load screw/box lug
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Conductor range: #8–6 AWG copper; #8–4 AWG aluminum
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Reference temperature: 104°F (40°C)
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Certifications: UL Listed; CSA certified
Common Applications
- Compatible Siemens panelboards requiring the exact B250 or a listed Type BL 50 A two-pole breaker.
- 120/240 V feeders and equipment circuits requiring common-trip protection.
- Like-for-like replacement in manufacturer-listed BL panelboard equipment.
